def _emulate_yield_from(self, targets: Optional[List[ast.Name]], node: ast.YieldFrom) -> Iterable[ast.AST]: generator = ast.Name( id='_py_backwards_generator_{}'.format(self._name_suffix)) exception = ast.Name( id='_py_backwards_generator_exception_{}'.format(self._name_suffix)) yield ast.Assign(targets=[generator], value=ast.Call(func=ast.Name(id='iter'), args=[node.value], keywords=[])) assign_to_targets = [ ast.If(test=ast.Call(func=ast.Name(id='hasattr'), args=[ exception, ast.Str(s='value'), ], keywords=[]), body=[ ast.Assign(targets=targets, value=ast.Attribute( value=exception, attr='value')), ], orelse=[]), ast.Break()] if targets else [ast.Break()] yield ast.While(test=ast.NameConstant(value=True), body=[ ast.Try(body=[ ast.Expr(value=ast.Yield(value=ast.Call( func=ast.Name(id='next'), args=[generator], keywords=[]))), ], handlers=[ ast.ExceptHandler( type=ast.Name(id='StopIteration'), name=exception.id, body=assign_to_targets), ], orelse=[], finalbody=[]), ], orelse=[]) self._name_suffix += 1
def visit_ExceptHandler(self, n): if n.name is None: name = None elif isinstance(n.name, ast27.Name): name = n.name.id else: raise RuntimeError("'{}' has non-Name name.".format(ast27.dump(n))) return ast3.ExceptHandler(self.maybe_visit(n.type), name, self.visit(n.body))